Dutch Hollow Subwatershed Site 4-1 Reservoir Report
Last Updated: December 15, 2025
Dutch Hollow Subwatershed Site 4-1, located in Woodbury County, Iowa, is a crucial water resource managed by the local government for multiple purposes, including fire protection, stock, small fish pond, and flood risk reduction.
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Summary
The dam, completed in 1984, is an earth structure standing at a height of 42 feet and stretching 530 feet in length. With a storage capacity of 104 acre-feet and a surface area of 5.3 acres, the dam plays a vital role in managing water flow and reducing the risk of flooding in the area.
Managed by the USDA NRCS and regulated by the Iowa DNR, Dutch Hollow Subwatershed Site 4-1 has a low hazard potential and a moderate risk assessment rating. The dam is designed to prevent uncontrolled spillage, ensuring the safety and stability of the surrounding environment. Despite not being rated for its current condition, the dam continues to serve its intended purposes effectively, with regular inspections and enforcement measures in place to address any potential concerns. Recognized as a valuable asset in water resource management, this site is a key component in the overall conservation efforts in the region.
As a part of the larger TR-Koker Creek watershed, Dutch Hollow Subwatershed Site 4-1 contributes to the overall ecological health and water quality of the area. With its strategic location and design, the dam helps maintain a balanced ecosystem while also providing essential services to the local community. As climate change continues to impact water resources, the management and maintenance of sites like Dutch Hollow Subwatershed Site 4-1 become increasingly important in ensuring the resilience and sustainability of the region's water infrastructure.
Year Completed |
1984 |
Dam Length |
530 |
Dam Height |
42 |
River Or Stream |
TR- KOKER CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.3 |
Drainage Area |
0.17 |
Nid Storage |
104 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
42 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
14800cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Dutch Hollow Subwatershed Site 4-1